50 
THOMPSON YATES LABORATORIES REPORT 
INTRODUCTION 
The present research has been directed towards further examination of the distribution of the 
spinal nerve-roots. It has been pursued in continuance of previous* experiments dealing with 
the spinal pairs below the brachial. The communication treats 'of especially the skin-fields of the 
cranial and cervico-brachial nerves. In order to obtain a more perfect idea of the scheme of 
distribution of each entire spinal nerve, the muscular fields of the spinal nerves of the limb region 
have been concurrently determined by separate experiments. Finally, these motor and sensory 
fields having been delimited, and thus the requisite prelimen to the original aim of the inquiry 
carried through, the examination of certain spinal reflexes has been proceeded to. I beg to 
sincerely thank Professor Michael Foster for his kind encouragement throughout. 
SECTION I. DISTRIBUTION OF CRANIAL AND CERVICO-BRACHIAL 
NERVES TO SKIN AND TO MUSCLE 
Previous Observations 
On the sensory distributions of the cervical and brachial nerves of the Monkey there 
exist no previous observations. On that of the cranial Vth, Aldren Turner and Ferrier t 
have not long since published experiments : not, however, undertaken for the same purpose, nor 
dealing with the same portion of the subject as my own. On the motor distribution of the 
brachial nerves there only exist the original observations by Ferrier and YeOjJ and the later and 
less detailed by Forgue and Lannegrace.§ These I have abstracted in a recent paper,|| and will 
not therefore recapitulate here. A certain number of observations on the distribution of the lowest 
brachial nerves were included in my own previous papers,1I and a part of the present results have 
been referred to in a paper by my friend. Dr. Henry Head,** to whom, though they were not 
perfectly complete at the time, they presented interest for comparison with his own clinical 
observations. The anatomy of the brachial limb is sufficiently alike in Monkey and Man 
to invite collation of results yielded by experiment on the former with the dissections of 
HERRiNGHAM,tt and with the clinical investigations of Thorburn,JJ Head,§§ Mackenzie,|||| 
Starr,1T1[ Bruns,*** and others carried out upon the latter. 
* Sherrington, 'Phil. Trans.,' B, vol. 184, p. 641, 1892. 
f ' Phil. Trans.,' B, vol. 185, p. 719. 
X ' Proc. Roy. See.,' London, 1881. 
§ 'Compt. Rend. Acad. d. Sc.,' Paris, 1884. 
II 'Journ. Physiol.,' Cambridge, vol. 13, 630, 1892. 
^ 'Journ. Physiol.,' /oc, cit. ; ' Phil. Trans.,' loc. cit. 
** 'Brain,' London, 1894, 339, 480, pt. Ixvii, cf. figs. i;9 
and 60, chap, v, p. 474. 
ff 'Proc. Roy. Soc.,' London, 1887, p. 440. 
XX 'Brain,' London, 1890. 
§§ 'Brain,' London, parts Ixi, Ixii, 1893; Ixvii, 1894; 
Ixxiv, 1896. 
nil 'Journ. Path, and Bacteriol.,' 1893. 
fff' Brain,' London, 1894, pt. Ixvii. 
««» 'Arch. f. Psychiat.,' Berlin, vol. 24, p. i. 
